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Thanks for all the help everyone! Hope we're close to done!
The Shop
Edit:
There was another 18 125 at the races, man it sounded good and looked fun. Hope I get there someday soon.
Has anyone experienced electrical issues on these bikes? My neighbor who is an ex-mechanic thinks that I have a CDI or stator going bad. Is there a repair manual for these things that explains how to test the electrical system? The "user" manual is pretty useless.
It's hard to say since I can't do much street testing but I swear it gets worse as the bike gets warmer. It seemed way worse after a few laps on the track.
https://youtu.be/6hnXCpNkDRM
Could it be a carb issue?
Bad gas?
Maybe do a compression check?
I'll go through the carb again this weekend, compression feels strong but I dont have a tester, I drained the gas that came in it and replaced it with fresh non-ethanol.
Gaskets should be here today so I can measure ring gap, clean powervalve and check deck height.
Wish I could find a service manual to check the stator. Really starting to lean towards electrical since it seems to get worse as heat builds.
Pit Row
Pilot 30
470 main
slide 5.5
needle 42-71 3rd clip from a 2019.
Have the jug off now. Piston looks good, powervalve is clean as can be. Going to reassemble with new orings and wait for the f1 arms to show up.
So I said f-it and ordered a plug boot, coil and stator. Will replace the boot, then test, coil then test, and hopefully will be able to return the stator.
Will be awesome if all of this was because of the plug boot.
I have a 30 pilot and a 470 main so I'll give it a try.
The KTMs are not identical and have better flowing airbox-hence less jetting problem. A WFO rider that never lets off will not feel the problem- they jet for WFO.
Ignition readings are tough to get precise...see the temp reading for resistance?,and your leads can effect that too.
Your PV arms operate smoother than mine since you polished them-but my bike runs great with them from factory and do not hang up.
The solutions are opening up airbox see right and left side. Then the jetting.The slide is tooo rich and make the part throttle stumble bog blubber..Its clear in your video.The PV is RPM sensitive. The crackling rich stumble is at part throttle even thought the revs are up as the bike has no load.
Here's pictures of my modified slide.The peak is 7.2mm. Width is 24.8mm. This is close to a 5.5 slide now. This took 30 minutes with dremel and drum sander. The other jetting is PV-2.25,32.5 pilot,460-500 main(500 in sand),Needle 42-75 1st clip,S-7 nozzle, AS 1/4-1.(1/4 was current setting), 40-1 sunuco 110 with Klotz. I'm at 200 ft,,low 90s now,and 65+% humidity. You maybe at 4000 ft and thinner air which would magnify the rich stock slide. We have high humidity that nullifies the lower altitude. AJ that posted before and slipdog had posts last year that walked through a similar issue on TC250.
My bike runs like enduro model now...smooth excelleration from idle to top. Doesnt drool or foul plug. On the track the 125 races I've been in,I'm always in top 3 too first turn,,and on a twisty slippery track we run at wildwood fl the bike is sweet pulling from down low through midrange to revving like it should. The power delivery has me finishing 2-3 spots better. Some riders that say there bike is fine now...just don't know how good it could be....I hope I haven't wasted my time giving the answer. The slide mod will be night and day better.Good luck
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